2324659

Information

• Patent Grant
• 2324659

• References
• Source

• Patent Number

  2,324,659

• Date Filed

  Not available

• Date Issued

  Tuesday, July 20, 1943
  81 years ago

• CPC

  • H04M5/12 - Ringing or otherwise calling substations

• US Classifications

  • 379 - Telephonic communications
  • 315 - Electric lamp and discharge devices: systems
  • 381 - Electrical audio signal processing systems and devices